According to Chinese medicine, the common causes of bad breath are stomach fire, dietary stagnation, phlegm and heat congestion of the lungs, etc., and bad breath needs to be selected according to the cause of the medicine. 1. Stomach fire bad breath: manifested as a large amount of food and drink, easy to hunger, burning pain in the stomach and epigastric region, swollen gums, thirst, constipation, etc., can be symptomatic to be clear stomach powder plus subtraction treatment, kidney deficiency and inflammation of the fire and pregnant women should not be used to clear the stomach powder. 2. Dietary stagnation and bad breath: in addition to bad breath, there can be epigastric (abdominal) distension, pain and refusal to press, as well as belching and swallowing of acid (swallowing the acid in the stomach upward), anorexia and vomiting, etc., can be used to Hovenia Conducting Stagnation Pill treatment. Hovenia vulgaris stagnation-inducing pill adverse reactions and contraindications are not clear. 3. Phlegm-heat congestion of the lungs halitosis: mainly due to coughing and spitting pus and blood fishy phlegm, resulting in bad breath, in addition to chest tightness, wheezing, restlessness, thirst, and constipation and discomfort, etc., can be used to treat reed stem soup with additional subtractions. Adverse effects and contraindications of Reed Stem Soup are unknown. When using medication, it is necessary to be guided by a traditional Chinese medicine practitioner to use the medication, do not use the medication arbitrarily, in order to avoid adverse consequences.